Medical compression cuffs are socks specifically designed to apply pressure to the upper extremities, which can help improve blood circulation in the upper extremities, reduce discomfort and swelling, and prevent or treat some diseases of the vein and lymphatic system, such as varicose veins, deep vein thrombosis, venous ulcers, lymphedema, etc. 1. Medical compression sleeves come in different pressure grades, from mild to severe, generally expressed in millimeters of mercury (mmHg). Different stress levels are suitable for different conditions and groups of people, and generally require a doctor's prescription and guidance to use 2. The principle of medical compression cuffs is to improve venous function by grading pressure, that is, applying maximum pressure at the wrist and then gradually decreasing it along the upper arm, which can promote blood return to the heart and prevent blood from pooling in the veins.